Chase-securing device for printing-machines.



,No. 7|7,l4l. Patented Dec. 30, I902.

J. THOMSON.

CHASE SECURING DEVICE FOR PRINTING MACHINES.

(Application filed Apr. 23, 1902.i

(No Model.)

twenroi UNITE STATES ATENT OFFICE.

JOHN THOMSON, OF BROOKLYN, NEYV YORK, ASSIGNOR TO JOHN THOMSON PRESSCOMPANY, OF JERSEY CITY, A CORPORATION OF NEIV JERSEY.

NEIV JERSEY, AND NEW YORK, N. Y.,

CHASE-SECURING DEVICE FOR PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 717,141, dated December30, 1902.

Application filed April 23, 1.902. Serial N0.104=,382. (No modeli- Ioall whom/ it ntcty concern; Be it known that 1, JOHN THOMSON, a citizenof the United States, residing at Brooklyn, in the county of Kings andState of New York, have invented certain new and useful Improvements inChase-Securing Devices for Printing-Machines, of which the following isa specification.

This invention relates to platen printinglo presses, and moreparticularly to the means for securing and holding the chase in positionon the bed of the press; and it has for its object to provide animproved means for ac complishing this result; and it consists in a I 5device constructed and arranged substantially as hereinafter moreparticularly set forth.

In the accompanying drawings, Figure 1 is a side view, partly insection, of a portion of the bed of.a platen printing-press, showing thechase-securing device in position; and Fig. 2 is a rear elevation of thesame.

While my present invention is more especially adapted for use inconnection with what is known on the market under the trade-name of aOolts Armory Press, it is, of course, applicable to other forms andstyles of press, and its detail of construction may be modified by thoseskilled in the art to adapt it to these constructions without departingfrom the spirit of the invention.

In the accompanying-"drawings I have shown a portion of a bed B of aprinting-press having a face B, on which the chase or form C, containingthe type or printing-surface or other devices, is to be secured, andthis may be supported on lugs or projections b at the bottom of the bedor otherwise in any wellknown manner. The chase is adapted to be 0secured in position by a chase-latch 1, which is shown as having acurved forward end to engage the edge of the chase and as having a bodyportion 2, provided with a threaded opening 3 in its rear portion, andadapted to 5 move in this threaded opening is a threaded bolt 4, whichis journaled in a standard 5, attached to the upper surface of the bed13. The upper end of the bolt 4 is provided with suitable means forrotating it, shown in the form of a bevel-gear 6, and there is alsoprovided means for rotating this in the form of a bevel-gear 7, mountedon a horizontal shaft 8, also journaled in the standard 5 and preferablyextending to the side of the press and being provided with suitablemeans for oper- .ating it, as the hand-wheel 9. Thelower end of thethreaded bolt acts as a journal. In the present instance the end 10 isshown reduced in size and as fitting an opening 11, drilled or otherwiseformed in the bed B. It will be seen that with this construction byrotating the threaded bolt 4 the latch 1 may be raised or depressed soas to engage or disengage the chase, and it will further be observedthat this movement is positive in one direction or the other and in aright line and that by manipulating the threaded bolt the desiredpressure of the chase-hook on the chase may be quickly obtained and thechase can be quickly released from the pressure of the latch.

The whole device is exceedingly simple in construction, can be stronglymade, is posi tive in its movements, and not likely to get out of orderor be subject to wear. Moreover, in consequence of the arrangement anddis posal described the impingement of the outer end of the latch uponthe chase acts to cramp or jam the threaded bolt, sothat the jar andvibration of the press when in operation do not act as in previousdevices of this character to automatically loosen the grip of the latchupon the chase.

What I claim is- In a platen printing-press, the combination p with thebed and a chase thereon, as O, of a chase-latch and bolt threaded in therear portion of the latch, a beveled gear attached to the upper end ofthe bolt and an actuatingshaft with a hand-wheel on its outer end and abeveled gear on its inner end, meshing with the gear on the bolt,whereby the chase-latch is caused to move vertically and cramp the boltwhen its outer end impinges upon the chase, substantially as and for thepurpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN THOMSON.

Witnesses:

JOHN MOKINNON, SAMUEL H. WEBB.

